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YOUR RESEARCHInterior noise after IMS upgrade
Leading reported evidence
Check clearance
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Performed · outcome unconfirmed · Original poster
@onefastviking: I just checked the clearance on the exhaust tips.
Leading evidence: 'Check clearance' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check clearance' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
We had the car on the lift and revved the engine in gear and in neutral, and checked fluid levels.
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Suggestion
Easy to check, easy to repair, parts should run around $400.00 +/-
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Suggestion
You can also take a large prybar and check for movement, but knowing what excessive movement is comes after checking known good and bad ones.
Check mounts and see if thats causing or contributing
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Suggestion
It sounds like you have a good tech working on it, have him or someone that knows check the mounts and see if thats causing or contributing to the issue.
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The car is a 2000 C2 tiptronic Cab.
I had the IMS, RMS, X51 Oil pan, Low temp thermo upgrades done with LNEngineering parts last week as preventative maintenance. There were absolutely no issues with the car before-hand. As soon as I started the car after the upgrade, I noticed a higher pitched sound that wasn't there before the work was done. Not a squeal, but a sound that wasn't present before.
The sound increases with RPMs whether the car is in gear or not. It's not a high-pitch sound per se, but a higher pitch sound than the normal engine rumble. It's a whine which reminds me of when I used to put heavy-duty snow tires on my cars. Before I had the work done you couldn't tell that the engine was in the rear, now it's very obvious. The mechanics don't hear anything unusual, but I just know it sounds different to me.
There is no unusual sound outside of the car or in the engine compartment, only in the interior. We had the car on the lift and revved the engine in gear and in neutral, and checked fluid levels. Everything looks good.
At this point I'm considering modifying the cats just to drown out the sound. Aside from that, any other ideas?
I had no noticeable, audible change after the LN IMS bearing, new RMS & clutch. I can't think of how any of these changes would make a difference if correctly installed.
Honestly? I'm betting you're listening extra hard now since doing the repairs/PMs. I'm like that too.....
Did the shift normally feel like that?
Did the engine normally vibrate like that?
Was that squeak there before?
....
Not uncommon if old and weak engine mounts and trans is removed without properly supporting the engine.
What happens is the weight of the engine is all or mostly put on the old weak engine mounts and then they fail right away or very quickly after. Sometimes just one will fail, sometimes both.
So check the mounts, look for sag, height difference, or even and unevenness from where the bolt goes thru. Sometimes you can even just look at the exhaust tips and see that one is lower than the other. Also look for the dreaded leakage. Then replace as needed and I would bet that your interior noise will be resolved.
Easy to check, easy to repair, parts should run around $400.00 +/-
+1
I am the same way. I listen too hard all the time. If someone else drives my car with me as a passenger (which I love to do with guys that never have driven a p-car), I start feeling and hearing things when I get back behind the wheel. It's all in my head.
Did you have it done at Rudtners? Did Bill listen, or one of his guys? I would trust Bill. He has a good ear, and should be able to tell if something doesn't sound right.
I'll be at Nassau Coliseum this morning in my 996, watching some of the autocross. If you can swing by, I'd like to have a listen.
@onefastviking: I just checked the clearance on the exhaust tips. One is about 1 finger and the other is just under two fingers. Does this point to the engine mounts or is that amount of difference typical?
@Divot: Sorry I just saw this now or I would have headed to the Coliseum to take you up on your offer. Yes, Bill did the work and was great about checking out the car when I brought it back. The engine sounds fine except from inside the car.
I agree that I do have the tendency to "listen hard". That comes from many years of boating, where an unusual sound could mean that you might get stranded somewhere you don't want to be. That being said, I noticed the difference as soon as I started the engine, without straining to hear.
Adjustment of tips and or rear bumper could take up a little but from what you have complained or explained, I would take a bet that the right side (passenger side) is the 2 finger tip and yes you probably have either a bad motor mount or a sagging one which is transfering some more vibration and noise than you are use to.
You stated it's a 2000 model so it's 10 years old, I'm guessing atleast 60K miles from the repairs you are doing, maybe even more, and it's probably never had mounts replaced so it's not an uncommon failure. Have them check the trans. mount also since it works together with the engine mounts.
It sounds like you have a good tech working on it, have him or someone that knows check the mounts and see if thats causing or contributing to the issue.
Let us know what you find.
@onefastviking - Your theory makes the most sense to me. The car has 38k miles and yes, the 2 finger tip is on the right side. How did you know that?
Do motor mounts always leak when they're shot? We had the car on the lift and didn't notice anything leaking, though we didn't specifically look at the motor mounts.
Mine did it for a while and I'll try listening today to see if it still does it. Doesn't seem to do it anymore but I might be used to it. Sure sounds like power steering pump but eh.
I'm back and I think the sound has gone away. It could be motormount oriented. I've been meaning to replace mine and the trans mount since I'm getting annoyed by the thumps when getting on it.
Try getting on it and see if you hear a thump sort of sound like the engine or trans is twisting and hitting something. If you do hear a thump I'd say its the mounts.
The motor mounts do not ALWAYS leak when bad, although that is when they are really shot completely. Look at the mount from the bottom and see if the bolt/stud looks centered in the mount. Also look at the rubber center piece and see if one (probably rt side) is hanging down lower than the left side mount. You can also take a large prybar and check for movement, but knowing what excessive movement is comes after checking known good and bad ones.
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